Walker 350-34441 Oxygen Sensor - Downstream

Walker 350-34441 Oxygen Sensor Overview

Walker Products 350-34441 is a heated downstream oxygen sensor built for specific BMW applications. It is engineered as an OE-style replacement to deliver the diagnostic feedback the ECU expects, helping maintain proper engine management and emissions control.

Walker Products Aftermarket focuses on application-specific engine management and oxygen/air-fuel sensors, with fitment matched to the vehicle position and system requirements. For BMW 325i, 528i, 530i, and X3 models, this sensor is a direct-fit solution for downstream service needs.

Key Features

• Part number: 350-34441
• Heated oxygen sensor for downstream placement
• Specific-fit design for the listed BMW applications
• 4-wire configuration with 22-gauge wiring
• Radiused polygon male connector
• Threaded mounting with 18.0 mm thread diameter
• Wiring harness length: 12.32
• Overall length: 15.87

Detailed Description

This Walker oxygen sensor is designed for downstream monitoring on select BMW vehicles, including 2011-2013 BMW 325i, 2011-2012 BMW 528i and 530i, and 2007-2011 and 2010-2012 BMW X3 applications listed by cylinder bank and position. The sensor supports ECU feedback for emissions and fuel-control monitoring, making it a practical replacement when the original sensor has aged or failed. If you are searching for a downstream oxygen sensor for BMW 325i, BMW 528i, BMW 530i, or BMW X3, part number 350-34441 is built around those exact applications.

This part cross-references no listed aftermarket part numbers in the provided data.

What It Helps Address

• Check engine light related to downstream oxygen sensor faults
• Poor fuel economy caused by inaccurate exhaust feedback
• Rough engine operation tied to sensor signal degradation
• Elevated exhaust emissions from a failing oxygen sensor
• Stored ECU fault codes associated with the affected sensor circuit

Installation Notes

Confirm the connector shape, thread diameter, and downstream position before installation. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion, since damaged wiring can shorten service life and affect signal quality. Verify the vehicle application by model year and cylinder-bank notes before ordering or replacing the sensor.

Quality Assurance

Walker Products manufactures engine management and oxygen/air-fuel sensors as OE-replacement parts for specific vehicle applications. The company is ISO 9001/TS 16949 certified and has supplied engine management components since 1946.